Yasuyuki Matsushita, Beijing CN

Yasuyuki Matsushita, Beijing CN

Patent application number

Description

Published

20090079987

Photodiode-based Bi-Directional Reflectance Distribution Function (BRDF) Measurement - Photodiode-based bi-directional reflectance distribution function (BRDF) measurement is described. Multiple photodiodes are distributed approximately symmetrically at a fixed distance from a surface to be measured. One or more of the photodiodes are directed to emit light, while readings are gathered from the other photodiodes that are not emitting light. The readings are processed based on previously measured calibration data to generate BRDF values.

03-26-2009

20090268062

RADIOMETRIC CALIBRATION FROM NOISE DISTRIBUTIONS - Technologies that enable correcting for the non-linear relationship between scene irradiance and digital pixel intensity values of an image of the scene produced by a camera. Imaging noise is used as a signal from which a corrective function is derived. Noise distributions from the image are evaluated to determine the radiometric response function of the camera, from which an inverse response function is computed and used for calibration.

10-29-2009

20090268938

PROBABILISTIC INTENSITY SIMILARITY MEASURE BASED ON NOISE DISTRIBUTIONS - Technologies for comparing observed intensities using a probabilistic similarity measure. In the probabilistic similarity measure example, there is no attempt to estimate a true intensity. Rather, the similarity of two observed intensities is defined as the likelihood that they each resulted from the same but unknown true identity while taking into account the noise characteristics of the camera observing the intensities. Since the true intensity is unknown, all possible true intensities are taken into account, rather than using a specific true intensity estimate. The probabilistic similarity measure indicates the degree to which two intensities correspond to the same intensity without estimating a true scene intensity value.

10-29-2009

20090303330

RADIOMETRIC CALIBRATION USING TEMPORAL IRRADIANCE MIXTURES - A method of calibrating a brightness value measured by a camera with an amount of light received by the camera includes creating a series of measurements, wherein for each measurement the amount of light received at an image plane in the camera is controlled to be a known ratio of two opposed irradiance values: a high irradiance value and a low irradiance value. Each ratio is correlated with the brightness value measured by the camera. A function is obtained describing the correlation.

12-10-2009

20100164986

Dynamic Collage for Visualizing Large Photograph Collections - Described is a technology in which a collage of digital photographs is dynamically computed and rendered so as to vary the photographs that are visible in the collage over time. A dynamic collage mechanism coupled to a source of photographs computes a collage for visible output, and dynamically updates the collage on a scheduled basis by adding different photograph(s) in place of other photograph(s). Each arrangement of the photographs in each updated collage is computed from a previous collage. Also described is layout optimization in which the photographs in the updated collage are translated, rotated and/or layered so as to cover a maximum amount of the overall area of the collage.

07-01-2010

20100165123

Data-Driven Video Stabilization - Described is a technology in which existing motion information (e.g., obtained from professional quality videos) is used to correct the motion information of an input video, such as to stabilize the input video. The input video is processed into an original motion chain, which is segmented into original segments. Candidate segments are found for each original segment, and one candidate segment is matched (based on matching criteria or the like) to each original segments. The matched candidates are stitched together to form a changed motion chain that via image warping changes the motion in the output video. Also described is building the data store by processing reference videos into motion information; different data stores may be built based upon styles of reference videos that match a particular style of motion (e.g., action video, scenic video) for the data store.

07-01-2010

20100201823

Low-Light Imaging Augmented With Non-Intrusive Lighting - In some implementations, invisible light is emitted toward a subject being imaged in a low-light environment. A camera having a first color image sensor captures an image of the subject. Image processing is used to correct distortion in the image caused by the invisible light, and an augmented color image is output.

RADIOMETRIC CALIBRATION USING TEMPORAL IRRADIANCE MIXTURES - A method of calibrating a brightness value measured by a camera with an amount of light received by the camera includes creating a series of measurements, wherein for each measurement the amount of light received at an image plane in the camera is controlled to be a known ratio of two opposed irradiance values: a high irradiance value and a low irradiance value. Each ratio is correlated with the brightness value measured by the camera. A function is obtained describing the correlation.

04-26-2012

20120133780

CAMERA CALIBRATION WITH LENS DISTORTION FROM LOW-RANK TEXTURES - A “Camera Calibrator” provides various techniques for recovering intrinsic camera parameters and distortion characteristics by processing a set of one or more input images. These techniques are based on extracting “Transform Invariant Low-Rank Textures” (TILT) from input images using high-dimensional convex optimization tools for matrix rank minimization and sparse signal recovery. The Camera Calibrator provides a simple, accurate, and flexible method to calibrate intrinsic parameters of a camera even with significant lens distortion, noise, errors, partial occlusions, illumination and viewpoint change, etc. Distortions caused by the camera can then be automatically corrected or removed from images. Calibration is achieved under a wide range of practical scenarios, including using multiple images of a known pattern, multiple images of an unknown pattern, single or multiple images of multiple patterns, etc. Significantly, calibration is achieved without extracting or manually identifying low-level features such as corners or edges from the calibration images.

05-31-2012

20120147198

RADIOMETRIC CALIBRATION FROM NOISE DISTRIBUTIONS - Technologies that enable correcting for the non-linear relationship between scene irradiance and digital pixel intensity values of an image of the scene produced by a camera. Imaging noise is used as a signal from which a corrective function is derived. Noise distributions from the image are evaluated to determine the radiometric response function of the camera, from which an inverse response function is computed and used for calibration.

06-14-2012

20120224789

NOISE SUPPRESSION IN LOW LIGHT IMAGES - A low light noise reduction mechanism may perform denoising prior to demosaicing, and may also use parameters determined during the denoising operation for performing demosaicing. The denoising operation may attempt to find several patches of an image that are similar to a first patch, and use a weighted average based on similarity to determine an appropriate value for denoising a raw digital image. The same weighted average and similar patches may be used for demosaicing the same image after the denoising operation.

09-06-2012

20130135489

RESPONSE FUNCTION DETERMINATION BY RANK MINIMIZATION - A response function of a device may be determined using rank minimization to transform a problem of determining a response function of the device into a framework of a rank minimization problem. A function is identified that minimizes a rank of an observation matrix which includes data of observations obtained by the device. This transformation may be used to determine a response function of the device under various conditions and to determine response functions of different devices in a unified framework.

05-30-2013

20130155297

RADIOMETRIC CALIBRATION FROM NOISE DISTRIBUTIONS - Technologies that enable correcting for the non-linear relationship between scene irradiance and digital pixel intensity values of an image of the scene produced by a camera. Imaging noise is used as a signal from which a corrective function is derived. Noise distributions from the image are evaluated to determine the radiometric response function of the camera, from which an inverse response function is computed and used for calibration.